Treynor leans heavily Republican by roughly 44 points: about 28% of voters vote Democratic and 72% Republican.
About 89% of adults in Treynor typically vote, above the U.S. average of about 62%. Among adults in Treynor, ~25% vote Democratic, ~64% Republican, and ~11% don't vote. The map below shows estimated turnout by block group.
How Treynor compares
Among cities within 25 miles, Treynor leans more Republican than 22 of 41 neighbors.
Treynor runs about 31 points more Republican than Iowa as a whole.
Why Treynor leans the way it does
This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Treynor, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 84% of households in Treynor are family households, about 17 points above the U.S. average of 67%.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Treynor, IA sits in the top tenth nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in Treynor looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Treynor is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 71%, about 11 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and more than 99% of adults in Treynor have completed high school, in the top fraction of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- McClelland, IA R+47
- Silver City, IA R+41
- Mineola, IA R+37
- Macedonia, IA R+50
- Carson, IA R+45
- Henderson, IA R+48
- Weston, IA R+36
- Underwood, IA R+46
- Oakland, IA R+31
- Council Bluffs, IA R+12
Cities with Similar Populations
- Hornbeck, LA R+89
- Minturn, CO D+29
- Kenduskeag, ME R+34
- Mahomet, TX R+58
- Rapid River, MI R+33
- Blue Lake, CA D+34
- Phoenix, IL D+81
- Belleair Beach, FL R+41
- Berry Creek, CA R+30
- Riley, KS R+50
Sources and methodology
Precinct-level voting records used to fit the model come from Iowa Secretary of State, Elections, distributed by the Voting and Election Science Team. Demographic inputs come from the U.S. Census Bureau (ACS 5-year estimates and the 2020 Decennial Census). Health and environmental inputs come from the CDC (PLACES and the Environmental Justice Index). Land cover comes from the USGS and EPA. Election-day and lead-up weather come from PRISM 4km daily grids and the NOAA Global Historical Climatology Network. Mail-voting and election-administration patterns come from the MIT Election Lab's Survey of the Performance of American Elections. Block-group crime detail comes from CrimeGrade. Internet data and modeling support provided by ISPreports.org.
Modeling and analysis by the BestNeighborhood data science team. Full methodology and findings: political spectrum map.
Methodology reviewed by the BestNeighborhood data team. Last updated May 2026.